Transmission main shaft
If this tranny goes out again I'll set the junk on fire and never own another harley. COME ON HARLEY, WHAT GIVES...BUILD A MACHINE LIKE YOU USE TO OR SHUT THE PLACE DOWN.
Last edited by driveone2; Sep 8, 2010 at 11:19 PM.
Good information on HD 6 speeds
First of all if your bike is still under warranty this is good thing. “So before your warranty expires” I stress that u take your transmission inspect cover off, one must remove exhaust and muffler on right side, then remove transmission inspect cover (6 Allen head bolts). Once u have done that and if u can’t, it’s about hour labor charge at your dealer (well spent 100.00 dollars). Look in the bottom inside of trans inspect cover for grey slugs and metal particles in this area. Appearance of this, then your transmission needs complete rebuild, all bearings, seals, gaskets need replacement. Inspecting at your oil plug magnet on regular services will not tell u anything, trust me on that one. Now (06 to10 models) any oil leaking from primary or growling sound from primary area is good sign you need to investigate. This grey slug and metal u will see on inspect side got there, because the swirl of the oil throws the entire particles to the inspect cover side. “Maybe this good thing”, that’s where it pools up and stays; these metal particles are caused by failure of main shaft bearing which is a two piece roller bearing. HD # 8967, which is a *** bearing # 559796. This two piece bearing has three races, two sets of roller bearings. Good inspection of this bearing once transmission is torn down ( 8 hours labor charge or more) u will see on “front wheel side” of the main shaft bearing largest inner race is galled in this area only, back side of same race looks normal.. This tends to make me believe that there are added forces to this front area of main shaft bearing. ( Why?) The other two races of this main shaft bearing are galled completely around both races. I have now rebuilt three HD 6 speeds, One Dyna and two FLH’S. same story for each identically, only different is mileages. Mostly from my experience 15000 miles to 28000 miles trouble starts with this main shaft bearing. Tomorrow I start my fourth transmission tear down on customer’s transmission. Now little word about your inner primary bearing and clutch hub bearing. Inspect yourself; remove primary cover and two bolts and chain tensioner, then slide out drive sprocket with chain and clutch hub to inspect. Here is heads up on these bearings. Failure of inner primary and clutch hub bearings is caused by your clutch hub splines cracking off. Inspect clutch hub splines to see if chucks are missing inside. These chunks go right into both bearings in time. It’s not the main shaft splines; it’s the clutch hub splines. So inspect carefully. Failure of both main shaft bearing and inner primary bearing can occur at anywhere from 15000 mile to 45.000 miles. At this top mileage mentioned, I would most definitely inspect and hope u still under warranty, just remember HD service bulletins and warranties are in house. Its HD’S best kept secret to not having recalls or really letting public information out. Opinion, HD 6 speeds (06 to10 models) are troubled until HD provides updates. I have phoned Baker transmission and they use same bearings and “possibly considering” making redesign on this bearing. But don’t hold your breath. Once U are off HD warranty, there is no update by HD as of yet to transmission problem. So new HD bearings are same old ones **** to failure cause by????. ( Bummer) HD knows there is problem and as usual put hands in the air. Normal for HD. So use that warranty well. Last but least,” run dinosaur oil” in primary and trany. The engine, run what u like for type of oil. Try this, when at traffic stop light and your in neutral, pull in clutch when u see amber light. This give time to slow down motion and u get less chunk in gear. Personally, this saves on splines of clutch hub or first start ups pull in clutch early. Before engaging trans... 4 all who doubt, inspection says all. Catch early save money, nothing wrong with that.
Last edited by driveone2; Sep 7, 2010 at 07:03 PM.
So many opinions on who's oil is better that so many guys and gals are confused. The issue is not the oil...ITS THE MOCO building JUNK tranny's. You should be able to run buttermilk in these trannys and never have a problem...though I wouldn't advise that...BUT COME ON....these bikes are way to expensive to be have trans troubles on after less that 20,000 miles....I just got this worthless ultra in fla after my RK put me down and now this is starting to show signs it is going to do the same thing... yea Im ticked off....25,000 bucks for 1500.00 machine
Last edited by driveone2; Sep 13, 2010 at 12:28 AM.
Last edited by xcelr8; Sep 7, 2010 at 07:34 PM.
I've been through enough legal battles to know - it's a total crapshoot! I'd hate to be further behind, cash wise, then I already am.
FWIW - I still haven't heard of any catastrohic failure of this bearing. Mine took 22K miles to get to what you see in the pictures, and it was still working. I have a feeling some just don't hear it, or accept it as "normal".
It is a fairly robust design as far as absolute failure is concerned. When one bearing goes (any of the 5 regarding the mainshaft), others will support the load - for a while anyway.
The Best of Harley-Davidson for Lifelong Riders
It would probably be far more cost effective to let the NHTSA, or a civic rights group, tackle this one.
Harley will battle with mega bucks to not loose this lawsuit against Joe Citizen.
However a plaintiff with very well researched and documented case, and a decent lawyer, and a thousand affidavit's of customer work performed regarding this issue, might have a shot.
AND NEVER trust a lawyer who say's it's a slam dunk case! They'll get paid either way!


